bechman



(No Model.) 2 Shets sheet 1.

' H. P. BEGHMAN. THROW-OFF MECHANI8M FOR PRINTING PRESSES.

No. 427,034. Patented May 6. 1890.

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(No Model.) 2 Sh'ets-Sheet 2.

- H, I.. BEOHMAN. I

THROW-OPP MECHANISM FOR PRINTING PRESSBS.

Nof 427,034. Patented May 6, 1890 E I I um MHHINIIHIIIM 1 Mi -W?! I .IIIIIMIM v r UNITED STATES PATENT @EEicE,

HENRY F. BECHMAN, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE SHNIEDE- lVEND & LEE COMPANY, OF SAME PLACE.

TH ROW-OFF MECHANISM FOR PRlNTlNG-PRESSES.

SPECIFICATION forming part of Letters Patent No. 427,034, dated May 6, 1890.

Application filed March 22, 1889. Serial No. 304,369. (No model.)

To all whom, it may concern.-

Be it known that I, HENRY F. BEOHMAN, of the city of Chicago, county of Cook, and State of Illinois, have invented certain new and useful Improvements in Throw-Off Mechanism for Printing-Presses, of which the following is a specification.

This invention relates to improvements in throw-off mechanism for printing-presses in to which the back legs of the press are actuated by an eccentric-shaft journaled therein and operated by suitable lever mechanism located in convenient position for manipulation by the operator, such devices being provided to I 5 enable theoperator to throw off or prevent an impression of the type at anytime during the continuous operation of the machine; but is more especially designed as an improvement upon the invention set forth in United States Letters Pate11t,.No.340,635, granted me August The prime object of this invention is to simplify the construction of the throw-off mechanism, and at the same time increase the effectiveness and durability thereof, and to have the mechanism of such a character that less power is required for its operation than in any of the other machines heretofore con structed.

Other objects are to utilize the power of a cam-lever for actuating the throw-off mechanism, and thereby not only reduce the power required to operate said mechanism, but also provide an automatic lock for holding the back legs, either on or off impression, against accidental shift-ing by the power of the impression, and to have the oscillating frame carrying the inking-rollers so supported upon the eccentric-shaft that itwill remain substantially unaffected by the shifting of the back legs, and the stroke imparted thereto by its operating-pitman will remain the same at all times, notwithstanding the shifting of the back legs, upon which it is supported.

These objects are attained by the devices illustrated in the accompanying drawings, in which T Figure 1 represents a side elevation of the frame of a printing-press, with such parts thereof as co-operate directly with my invention, showing devices applied thereto embodying my invention, and in their normal position while printing or on impression, Fig. 2, a similar view showing the throw-off 'mechanisin in its operative position and the back legs thrown off impression, Fig. 3, a detail horizontal section on the line 3 3 of Fig. 1, looking in the direction indicated by the arrows.

Similarlettersof reference indicate the same parts in the several figures of the drawings.

Referring by letter to the accompanying drawings, A indicates the main frame of the machine; B, the back legs carrying the typeform and inking-rollers, as usual in this class of machines, pivoted to the frame A, near the lower end thereof, and caused to vibrate by means of a pitman O, eccentrically pivoted to and operated by a revolving disk D, fixed upon a shaft journaledin the frame A in any wellknown and convenient manner, the opposite end of which pitman is attached to one end of an eccentric-shaft E, journaled in the back legs. This shaft, as more clearly shown in Fig. 3, has two parts eccentric to each other, 7 5 the main or body portion thereof, which is journaled in the back legs, being larger than the contracted end portion E, which projects eccentrically from the main portion, and to which the pitman O is directly but loosely connected, so that the shaft is free to revolve therein. It will thus be seen, however, that whenever the shaft is rotated the main body thereof must act as an eccentric and swing about the axis of the contracted portion, because this axis at all times bears a fixed relation to the operating-shaft of the machine, about which the opposite end of the pitman travels by reason of the attachment of said pitman to the eccentric-shaft, the distance between the ends of which cannot change, and therefore, whenever the shaft is caused to oscillate, the back legs will have a vibration upon their pivots independent of the Vibration imparted thereto by the pitman, as in my aforesaid patent. In order to produce this vibration I attach to the extreme end of the contracted portion. of the eccentric-shaft a crank-arm F, to which is attached the upper end of a connecting-rod G, the lower end of which is pivotally connected to a liftingbar II, pivoted at its opposite end I to the frame of the machine. Upon this bar, between the ends thereof, is pivoted an antifriction roller J, projecting into a curved or cam slot K in a hand-lever L, which latter is also pivoted at M to the main frame between the cam portion thereof and its free end, which projects upwardly and constitutes a handle N in convenient location for manipulation by the operator. The cam-groove K terminates at its ends in rounded portions or sockets O at opposite sides thereof, into which the anti-friction roller J snugly fits and constitutes an automatic lock against the accidental shifting of the cam-lever from either of its extreme positions. This camgroove is so arranged relative to the lifting-bar that whenever the lever is shifted in one direction, as shown in Fig. 1, the cocentric-shaft will cause the back legs to move forward in position for making an impression at each stroke thereof, and when shifted to the opposite position (shown in Fig. 2) the back legs recede slightly or are thrown back off impression, and thereby prevented from making an impression, notwithstanding the continuous operation of the machine. -Such an arrangement is extremely simple and effective, the parts are all strong and durable, are subjected to very little wear by the constant use thereof, and besides, by reason of the great leverage obtained by the employment of the cam-lever, the operation of throwing the press on or off impression is rendered much less laborious than is possible in any of the other constructions in which only a necessarily short lever can be employed.

Another important feature of this invention is the journaling of the oscillating frame P, which carries the inking-rollers, upon the contracted portion of the eccentric-shaft E, so that the said frame oscillates upon an axis in common with said shaft, and hence remains at all times unaffected by the rocking of the eccentric-shaft, notwithstanding the movement or vibration of the back legs produced by such rocking of the shaft. The advantage of such an arrangement is that the stroke or oscillation of this frame will remain the same atall times, because, being operated by a connecting-rod Q, attached eecentrically thereto and to the frame of the machine, as is usual in this class of machinery, and 0scillating upon a fixed axis as contradistinguished from a shifting axis, although vibrating with the back logs, the point of attachment of the connecting-rod will always bear a fixed angular relation to the axis and always produce exactly the same amount of oscillation of the frame.

.Vhile I have shown and described the eccentric-shaft as composed of a main body portion eccentric to the contracted journal end portions thereof, it is obvious that the entire shaft might be of any uniform diameter, with eccentrics mounted thereon only of a width corresponding to the width of their bearings in the back legs, the construction herein shown and described merely being preferred because of the increased strength of the parts and the greater facility with which such a shaft may be made.

Having described my invention, what I claim, and desire to secure by Letters Patent, 1s

1. In a printing-press, the combination of the vibrating back legs, a shaft, eccentrics thereon j ournaled in said back legs, a pitman attached to said shaft, and a crank-arm, also projecting therefrom, a pivoted lifting-bar, a connecting-rod pivotally secured at its ends, respectively, to said bar and crank-arm, and a cam-lever engaging and actuating said bar, substantially as described.

2. In a printing-press, the combination of the vibrating back legs, a shaft, eccentrics thereon j ournaled'in said back legs, a pitinan attached to said shaft, and a crank-arm, also projecting therefrom, a lifting-bar pivoted at one end, a connecting-rod pivotally secured at its ends, respectively, to the opposite end "of said bar and the crank-arm a-pivoted handlever, a cam-groove therein having end sockets, and a pin or anti-friction roller on said bar projecting into said groove, substantially as described.

HENRY F. BECIIMAN.

\Vitnesses:

W. S. L. ITAwKINs, J EDGAR LEE. 

